Glitches
Walk through walls on the ice cave

You can easily advance through this level of the game by exploiting the walk through walls glitch. Recharge your pan meter from the first Tinkerbell you find then return to the start of the stage and fly upward. Pan will disappear and actually be in the ceiling. From there you can just walk to the right and you will not be effected by walls or enemies.

Secrets
99 Lives

Fly into the spike filled cave in level 1. Once you see the 3-Up grab it and then allow yourself to die. Repeat this process until you get 99 lives.